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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86484cb57f0d485d190da8a373930d6d53f4f9fd3fd36c610c9f3101d430b93b' 
  AND token = 'q08N4vkW06m8ISlyExQ+NDq0ftgrWt3iaKekwyB461s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}